Servo-control valve

Details Servo-control valve Servo-control valve

1980-03-24

1982-02-23

Michalsky, Gerald A.

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

91433, 13762565, 251 50, F15B 13044

Patent

active

043165990

ABSTRACT:
An electromagnetically controlled hydraulic servo-control valve includes a hydraulic slide activated by an electromagnet with a plunger. The distributed pressure hydraulically pushes the slide and the plunger toward each other. Constrictions in the hydraulic conduits attenuate oscillations. The plunger and the slide have slightly different cross-sections to provide a control loop for the distributed pressure, affecting the position of the side. Use of a polarized electromagnetic supplied by a current that ranges from a negative value to a positive value doubles the regulating capacity. To prevent hysteresis of the pressure curves, as a function of the current, the electro-magnet can be supplied by a pulsed current or an alternating current with a continuous component. The servo-control valve might be used in connection with an automatic gear box control.

REFERENCES:
patent: 3095906 (1963-07-01), Kolm
patent: 3880476 (1975-04-01), Belart et al.
patent: 3958495 (1976-05-01), Bernhoft
patent: 4071042 (1978-01-01), Lombard et al.

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